Magnetic steel having a high content of silicon



Patented Sept. 29, 1925.

1 UNITED STATES P ATENT. o F1cE1;

FELIX THU'AUD, or PARIS, FRANCE, ASSIGN'OR or. oisinnaw wo socmrrn ELECTRO- METALLURGIQUES DE MONTRICHER,

FRANCE.

or PARIS, rmn'cn, A' con'r'om'nofi on.

MAGNETIC s'rnm. HAVING A man: omm: or-sILicoN.

To all whom it may concern: A I

Be it known that I, FELIX THUAUD, a citizen of the French Republic, residing at Paris, France, have invented certain new,

5 and useful Improvements in Magnetic Steels Having a High Content of Silicon, of which the following is a specification.

The present invention relates to-a new alloy forming 'a magnetic steel having a high content of silicon, and a large permeability. y l

This application is a division of my' ap plication Number 730,086, filed Aug. 4 1924.

Itis known that the'magnetic steels'in use ll hitherto have the following composition;

- Per c nt... Carbon -0.10fto 0.20- Manganese" 0.15- mono Sqilicon 1.50 to 3' l. ulphur Phosphorus -'i'"-f""" -.'-f* 9' 1 Numerous experiments have shown that -the compositions approaching this-which have been mentioned do not reduce the v hysteresis in sufficient proportions to enable a complete or almostcomplete demagnetiza tion of the 'metal' exposed to the action of}. magnetic field. In fact the hysteresis meter indicates losses of the orderof from 2 t0 3 watts due to a-considerable tension which becomes noticeable. in the form of heat.

For reducing these losses iof energy and to reduce them 'tora theoretical minimumthere is used, according to the present in-j vention, the following composition for Steels under consideration, v

'LettersPatentYisw-j 1 As a new article. of manufacture: amag- No Drawing. Original application filed August 4,'192 .,-ser'1a'1m. mom's. 1 "mvidea mia this application filed October 27, 1924. serialflio. 746,212;

forms pure iron, that is to say when it com prises 0.02% of carbon'and traces of manganose of sulphur and ofphosphorus-there are incorporated therewith; infsthe above pro ortions '1 silicon; 2, nickel; 3, titanium.

' ick'el and titanium havenever beenlused hitherto f in the 'manufacture' .of magnetic sheets. This application ofthese metals in ,the abovemagnetic' steels cdnstitutes one of the main' characterlstlcs, of the 1nvent1on.'

It has for its bbje'ct tod-eterminean appreciable improvement of the quality of the products obtained the hysteresis is reduced and. decreased from avalue of to a-value below 12W and the permeability-of these;

sheets is increased by ab'out t0%.

Having thus described my invention what I declare as new-and desire to secure by netic steel containing carbon 0.02 to' 0.05%,

' manganese 0.04 "to 0.07%, silicon to..- 4.20%, nickel 0.05. to '3 %,and;t1 tan1unr.

.1 testimonvwhereof I havef-signdf my name to' this specificationj 

